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There are lots of people come from different countries in the airport. However, it is really hard for foreigners to recognize the prices on the labels in the duty free shops because they use different dollars in their countries.
The price knowing is a electronic price labels which would be put in the duty free shop. All the foreign tourists need do is to scan their passports with the machine, then, the price knowing can recognize the countries where they come from. By doing so, it can alter the prices of the goods into their countries’ dollars. Therefore, the price knowing would make airports’ shopping activities better and easier.